Heavy and light duty container structure and method of making same



DTL. M3, 1956 A. MOORE HEAVY AND LIGHT DUTY CONTAINER STRUCTURE AND METHOD DE MAKING SAME Filed March 5, 1954 3 Sheets-Sheet l l. I 9 8 g 4 9 H )Y u) f [f lof E I lo f) 7 z @TT .2 S /s ,9 1A 15 a /5 5 9 l) if) (/4- \l/ lj/4\/K j 8 /20 m/z /ll i/Vx [3mi [,120

lNVENTOR @mfom G. A. MOORE HEAVY AND LIGHT DUTY CONTAINER STRUCTURE AND METHOD OF' MAKING SAME 3 Sheets-Sheet 2 Filed March 5, 1954 INVENTO'R Nov. 13, 1956 G. A. MOORE HEAVY AND LIGHT DUTY CONTAINER STRUCTURE AND METHOD OF MAKING SAME 3 Sheets-Sheet 3 Filed March 5, 1954 INVENTOR United States atent O HEAVY AND LIGHT DUTY CONTANER STRUC- TURE AN D METHOD F MAKING SAME The invention relates to metallic or fibrous heavy and light duty containers having the same basic structure and to a method for fabricating them. The invention is related in part to the class of containers disclosed in my co-pending applications Serial No. 278,528, iiled March 26, 1952, now U. S. Patent No. 2,731,167, issued January 17, 1956, Serial No. 283,217, tiled April 19, 1952, now U. S. Patent No. 2,712,880, issued July 12, 1955 and Serial No. 288,412, led May 17, 1952, now U. S. Patent No. 2,717,094, issued September 6, 1955. The present invention has for its object to provide certain new and useful advantages in the structure of the container and also present the co-operative means provided in the design of the container with which to carry out the method for its fabrication.

The principal object of the invention is to provide a simple but eiiicient method for fabricating rectangular shaped containers having an initially assembled structure composed of opposing related side walls with an integral end wall at each end thereof.

A further object of the invention is to provide a heavy duty container of the character described which may be constructed of web or flat sheet materials comprising the alternative use of fibrous sheet, steel, black or tin plate, aluminum sheet, bre glass Sheet or other flat web materials in the general category.

A still further object of the instant invention is to provide a strong space saving container of relatively large capacity for carrying various liquid commodities such as petroleum products, acids, lacquers, solvents and many other liquid commodities, the container being also adapted for the distribution of a wide variety of granular or viscous products.

Another object of the invention is to provide a container with side walls and pre-formed opposed end closure walls integrally related, one end wall having a pair of opposed slot openings adjacent `two opposed side walls adapted for entree of wall supporting anvils upon which to form the seams of the container, the slots being closed and sealed in a manner to strongly reinforce the end wall of the container after the anvils are withdrawn.

Still another object of the invention is to provide a container having a basic structure which provides all of the wall enclosures of the container, the walls having fiat and non-recessed seam junctions including both the end closure walls of the container.

A Vfurther object of the invention is to provide a simple method of entree of apparatus for interior support of the container walls through slot openings at sides of a preformed end wall, the supporting means being adapted to resist the pressure imposed to marginal exterior portions of the container structure when welding, soldering or curing resins with which to form united seams of the container.

And, another object is to provide a heavy duty metallic container with other opening and closing means adapted for filling and dispensing purposes and including other rice means for a light duty fibrous container having provisions for another form of filling and dispensing arrangement in an opposing end wall of the container.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following detailed description, which, when taken in connection with the accompanying drawings, will disclose and illustrate a preferred embodiment thereof.

In the drawings,

Fig. 1 is a plan view of an oblong strip of sheet material having a central area with opposed marginal gaps set inwardly of the basic parallel sides of the strip which forms a portion of the container walls.

Fig. 2 is a plan view of another oblong strip of sheet material having parallel marginal side and opposed marginal end areas disposed outwardly of medial bending lines shown in dot and dash, the strip being adapted to cooperatively form and complete the other walls of the container. t

Fig. 3 is a View in perspective of the pre-formed shape taken of the strip of Fig. l.

Fig. 3a is a fragmentary View in perspective of a modification in the pre-formed shape of Fig. 3.

Fig. 4 is a view in perspective ofthe pre-formed shape taken of the strip of Fig. 2 and showing transversely bent marginal side wall portions disposed in opposed position and inwardly from three sides of the shaped strip.

Fig. 5 is a perspective view ofthe assembled pre-formed strips showing their inverted relationship which forms four side walls and two opposed end walls `of. the container, and further showing two opposed channel shape marginal wall portions extended outwardly of one end wall with outwardly spaced fragmentary end portions of wall supporting anvil bar plates used in the method of forming the seams of the container.

Fig. 5a is a front end elevation of the assemblyof Fig.` 5.

Fig. 6 is a perspective view of the container assembly showing the wall engagements with the inserted anvil bar plates which are partially broken away.

Fig. 7 is a fragmentary view in upright perspective of the container showing an opposed end wall prior to being sealed at the opposed sides thereof.

Fig. 8 is another fragmentary View in perspective showing the steps of closing the side gaps of the container end wall.

Fig. 9 is a perspective View of the completed and hermetically sealed rigid container showing the bottom end thereof in inverted up-right position.

Fig. 10 is an end elevation of a modified reinforcement of the bottom end wall of the container.

Fig. l1 is an enlarged fragmentary view in perspective of a relatively light duty semi-rigid container in up-right position showing a filling tube engaged in one of the slot openings in the container end wall.

Fig. 12 is an enlarged fragmentary view of the container in up-right perspective showing the end wall closed and sealed. i

Fig. 13 is an enlarged fragmentary view of the container in up-right perspective showing the end wall opened to expose an oriiice, and t Fig. 14 is an enlarged perspective view of the container showing its end wall dispensing arrangement in action.

Referring to the drawings with reference to Figs. 1 to 4 inclusive, 4 indicates generally, one of the blanks that form two opposed side walls and an integral end closure wall, and 5 indicates the primary blank `that forms two opposed adjacent side Walls and another integral end closure wall of the container. The blank member 4 is primarily composed of metallic or other sheet material in guages from ten thousandths of an inch up to one eighth of an inch thickness or more depending upon the capacity and duty. requirements intended for the container. Two transverse parallel medial lines 6 divides the area of the blank to provide a central wall area portion a and two outwardly opposed wall area portions b in lateral'and longitudinal position. The central wall area is provided with two opposed parallel side edges 7 having .transversely disposed edges set inwardly of the dependent parallel side edges 9 of the blank. The medial lines 6 'are disposed inwardly of the transverse edges 8 and the wall portions b have straight parallel opposed end edges 10.

The primary blank member is composed of like sheet material and is provided with sub-divided flat wall area portions consisting of a central area c defined with opposed and parallel longitudinally disposed medial ylines 11 and two opposed'transversely disposed medial lines 12 which are in parallel. Lateral wall area portions d extend outwardly of each media line 12 and are further deinedwith medial lines 11 which terminate adjacent to outwardly disposed medial lines 13. The central area c is provided with two opposed extra marginal area portions 14 disposed outwardly of the medial lines 11 and which continue to extend in opposed directions to the ends of the blank as side margins. The margins are cut into with V-shaped notches 15 which have a slight fillet apex 16 disposed outwardly of the medial lines 15, the said apices being substantially central at each terminal end of each medial line 12 of the central wall area c. Each end of the blank is provided with transversely disposed marginal wall area portions 17 which are disposed outwardly of the medial lines 13 and separated at transverse parallel sides from marginal end portions 18 defined with transverse medial lines 19 and cut lines 20 which are in substantial linear alignment with the medial lines 11. The cut lines 20'terminate inwardly of the medial lines 13 and at the junction of the medial lines 19.

The blank 4 is pre-formed to the shape 21 (Fig. 3) by bending the blank over a form on the medial lines 6 to provide the end wall a and opposing side walls b. When bending relatively heavy sheet the blank may be pre-heated to facilitate bending manipulation. The end edges 8 are each disposed inwardly of the surface plane of the end wall a and spaced therefrom substantially one thickness of wall material.

The form 21 may be modified to the form 22 (Fig. 3a) by augmenting the top wall b with a further extending wall portion that will provide a bent opposing end wall 23, the end portion of which may overlap the end edge 10 of the opposing wall b, the purpose of such modification to be hereinafter described.

The blank 5 is pre-formed in much the same manner by bending the blank over a form to take the shape 24 (Fig. 4). The marginal portions 14 are bent into inwardly disposed flanges at right angles to each side of its depending wall c and d, the notches 15 being closed in abutment at each adjacent corner of the end wall c. The fillet apex 16 of the notch forms a slight corner bulk of outwardly projected material that is adapted to be peened inwardly toV tightly reinforce the junctional ends of the notch abutments and adjacent corners of the container end closure wall. The side wall corner junctions of the flanges 14 are formed` generally upon the medial lines 11 so that the extended portions 1S will bend inwardly from the parting'lines 20 to allow one side of the severed edge to lie in abutment with an inner marginal portion of the walll portion 17, `the other severed edge lying in substantially coplanar relationship with the general surfaces of the bent'flanges. 1

The pre-formed4 members 21, 24 are assembled together in inverted relationship, the end wall i of the member 21^-being opposed to the end wall c of the member 24; Prior tothe assembly, the inside surfaces of the iianges-14 and/ or the outer exterior margins of the walls b of themember 21V may be treated or coated with compounds suitable for activation or reactionu when applying Cit heat, pressure or llame to said marginal portions after the members are assembled together and made ready for seam forming. Epoxy resin may be applied as being suitable for seam forming if desired.

The assembly provides two opposed slot-like openings 25 (Figs. 5-5a) disposed outwardly of the two opposing side edges 7 of the end wall a of the component part` 21. The opposed side walls d of the part 24 co-operate to form the outer wall boundary of the slots 25 and the end edges 8 of the side walls b define the transversely opposed side portions thereof as illustrated in Fig. 5a. A pair of opposed parallel anvil bars 26 are entered through the slots 2S which constitute. open gates into the interior of the assembly, the width or depth of the bars being substantially equivalent to the interior width of two opposed adjacent side walls of the container struc* ture. The thickness of the wall supporting bars coincide with the width of the slots 25 for example, a quart to gallon size container may require one quarter to three eighth inches width whereas, a fifty-five gallon sizercontainer may require up to one and one quarter inches width to provide the necessary support for seam forming operation. The container assembly may be moved over the bars which may be fixed as stationary or, alternatively if desired, the container may be in fixed position and the bars moved into and through the end wall slots. The ends 27 of' the anvil bars stop against inner surface portions of the assembly end wall c and rest in abutment therewith during the seam forming operation.

Fig. 6 illustrates the container assembly engaged `with the supporting anvil bars 28 and in relative positions for opposing the seam forming pressure that is subjected to the exterior overlapping marginal flanges 14 of the container walls. The bars 28 may be supported with a spacing casting 29 which can be adapted to be stationary or haveV movement in any manner desired for the purpose hereinbefore described. The arrangement of the opposed flat container seams and internal bar supports provide4 simple means with which to subject the wall junctional seams with strong clamping pressure for oven heating and curing purposes, and may be hydraulically or mechanically operated in one cycle of operation. The pressure imposed to the top and bottom seam margins of the container is balanced by the margin supporting bars. Various well known methods may be employed for uniting the seams of the container assembly, the method selected being dependent upon the sheet material used and the size of the duty capacity intended for the container. Spot welding may be employed when using relatively heavy guage metallic sheet.v The wall side edges 9 of the component part 21 of the container are engaged in abutment with inner marginal wall surfaces of the component part 24 as shown in Fig. 7. These side edges may be doped with suitable compound prior to assembly and united with the said Wall margins when uniting the general seams of the container.

When the seams 14 are united upon the two opposed sides of the container 24, the anvil is withdrawn from Vthe slots 25. The container may be flushed with any desired liquid through said slots for internal cleansing or wall coating purposes. A circular hole 30 (Fig. 6)V may be provided through the end wall c and adapted with any suitable filling and dispensing threaded orifice desired for use in handling the container contents.

The container 2d (Fig. 7) may be closed and sealed efficiently in a simple manner inasmuch as the end closure Wall a is integralV with two opposing side walls and hence marginal portions of the opposing side walls d and form bending ledges for the wing gate-like portions 17. The side edges 32 of the said bent portions are in abutment with the side edges 7 of the end wall a to take the thrust when bending the said wing gate-like portions inwardly. The surface of the ends 8 also provi-de a seat for the inwardly bent portions 18 adjacent the bending junction-s thereof. Prior to bending the closing wings 17, a suitable sealing compound may be applied to the inner faces thereof after which, the wings are bent inwardly against the ledges 31 and downwardly over the bent fiange portions 18 and overlapping marginal portions of the end Wall zz adjacent to each of the edges 7. The bent portions 17 may be united to the bent portions 18 and end wall margins by methods hereinbefore described for the uniting of the seams 14 of the container. The end wall a (Fig. 9) preferably constitutes in general the bottom of the container. The end wall corner junctions of the container are stnongly reinforced by the plugging effects of the bent portions 18 into the slots 25 and overlapping wings 17 thus providing a hermetically sealed closure of the container.

When it is desired to fabricate the container for maximum heavy duty, the end walls of the container may be provided with added strength as illustrated in Figs. 3a and 10. The outer face of the end wall 23 when assembled into the component part 24 is disposed in surface contact with the inner face of the end wall c to form a double thickness top end wall of the container. The opposing bottom end wall may be provided with substantially two thicknesses as -illustrated in Fig. l0. The inner disposed slot closing portions 18 are lengthened so that they will have ends 33 in substantial abutment. The overlapping opposed wings 17 are lengthened so that the edges 34 are in substantial abutment and thus provide a flush two-ply end closure wall. The inner end wall 23 adds material strength to the opposite end of the container structure to oppose any pressure or impact subjected to the converging corner ends of the end closure `wall c of the container.

When carrying out the method of the invention to use fibrous web or more iiexible sheet material with which to fabricate the container for relatively lighter duty requirements, the structuralwalls of the container remain basically the same when modified to provide a top end closure arrangement of the container 24 as illustrated in Figs. l1 to 14 inclusive. opposed wing portions 17 which are slightly altered to serve the end portions of the blank member 5 in place of the portions 17 hereinbefore defined. The blanks 4 and 5 in this case may be made of fibrous board sheet material which may be coated or otherwise provided with a dependent film of thermoplastic material suitable for wall protection and seam bonding purposes when forming the container. One of the wings 17 is provided with a pair of opposed slit lines 40 spaced apart and extending downwardly of the top end of the wing, the slits are spaced substantially central thereof to form a latch lip portion 41`. The opposite wing i7 is provided with a central tab p0rtion 42 which projects upwardly `and outwardly of the end edges 43 of the wing. The tab isfurther defined with two parallel imperforate lines 44 extending downwardly fromA the top edges 43 and terminate `at substantially the terior plane of the transverse end wall a. i

The container 24 (Fig. ll) may be filled w-ith;its intended product by means of the hollow oblong shape tube 45 which may be blended in shape to a round filling tube extending downwardly from the source of product supply (not shown). The tube 45 enters into one of the open slots 25, the opposite open slot providing a relatively large vent which facilitates rapid filling of the container. This i-s due to the unrestricted displacement of air being allowed to freely leave the interior of the container while filling the container and hence will avoid any build-up of interior pressure therein during such operation. The con- The modification applies only to the tainer is closed in the same manner as hereinbefore described for the heavy duty embodiments of the structure. The folded wing end portion of the imperforate tab 42 is overlapped by the 'latching lip 41 of the opposing folded wing. The area section defined by the dot and dash lines 47, 48 is not sealed to the end wall a. The balance of area yof the folded wings 17" and tab 42 is sealed by application of heat and pressure or, by `any other suitable adhesive means desired. A small section of aluminum foil may be applied to the inner surface of the tab portion 42 and/ or to the related area section of the end Wall a if desired to facilitate the napless opening of the tab section of the container closure. The imperforate tab sides lie flatly to a portion of the flat end wall a and slot closing portions of the bent flanges 18 which are uniform in surface. The imperforate lines 44 do not penetrate through the inner coating of the wall material therefore, the dispensing orifice provided in the end wall of the container is efficiently covered and initially sealed by the inner flat wall surface of the tab section 42 in the wing 17".

The container may be conveniently opened by raising the latch 41 and lifting the unattached end portion of the tab 42, peeling it upwardly from its bonded relationship upon the parallel imperforate lines 44 and thus expose the orifice 46 as illustrated in Fig. 13. The side shoulders formed by the opened tab edges 44 `are set outwardly of the orifice edges 47 which provide a gate for the flow of liquid away from any part of the said adjacent shoulders. The tab 42 may be easily bent downwardly and upwardly against the bottom side wall of the container when pouring therefrom as illustrated in Fig. 14. The liquid stream while dispensing from the container is sharp as it leaves the orifice gate edges and any capillary liquid that may form when tilting the container upwardlyto shut off the stream is shielded from the container wall by the gate tab 42 thereby eliminating any drip or droplets upon the side wall or any other portion of the container which is a sanitary feature. The container is adapted to pour from a side wall corner edge when the tab is held in reverse direction as Ishown in dotted lines 42 beneath the container side wall. Such arrangement forms a relatively sharp pouring corner at the extreme edge of the container end wall for clean and non-fouling dispensing of |liquid from the container. The tab 42 again closes the orifice 46 by folding it back to its original position and tucking its end under the latch lip 41 which retains it in closed position. The latch overcomes the inherent spring of the tab which otherwise will not remain flat against the end wall a after being initially detached therefrom. Thebending junction 48 of the closure tab 42 is disposed to form the bottom of the gate orifice 46 which is quite contrary to the usual arrangements `of liquid dispensing orifices in fibrous containers. The improved arrangement renders the container strictly sanitary and economically efiicient for distributing commodities of various kinds including dairy products.

As described hereinbefore, the end wall side openings afford efiicient means through which to flush the interior of the container walls with any suitable liquid com pound such as may be lused for protective coating including the use of molten wax if desired. The facility provided by the said two opposing slot openings 25 in the end wall a insures eficient results in the speed of such operation facilitated by the large opening vent served by one of the opposing slots when introducing the liquid and the affording of a rapid drain of thel liquid through both slots to evacuate it from the interior of the con` tainer quickly.

The prime principle of forming the structure of the container of this invention affords many innovations offered by the nature of the design of the end wall closure for example, when fabricating the container of tin or turnplate by the method herein disclosed, the top closure may be sealed with solder or expoxy resinous adhesive. The latch 41 may be eliminated in such case and the end portion of the tab 42 tapered and exposed to receive the slot of the well known turning key used to open sardine cans. By turning the .key the tab may be wound upto peel an opening for the container to be used for dispensing purposes.

Itis-thought that theforegoing description is clear for an understandingof thefversatility of the contemplated improvements and attendant advantages of the container construction andv the simple and relatively inexpensive method contemplated for itsy basic structural fabrication. The design of the container is such an innovation in the structure ofa basic container that affords the construction of containers having an unusual range of size andl duty capacity'of wide scope without departing from the ,basic concepts of the said design. The convenient utility of the container, its space saving economy and simplicity of manufacture, contemplates a worthy contribution to the art of making containers iniitsr described lield, it will be apparent however, that various changes may be made in` the form, construction and detailed arrangement of the component parts of both the container and method of fabricationl without departing from the spirit and scope of the inventionor sacricing any of its principal advantages, the details as hereinbefore described being a preferred embodiment with which to clearly set forth the prime .principles of both the container structure and:

the method employed for its fabrication.

What is claimed is:

l. A container of sheet material comprising a body of substantially rectangular cross section having four side walls arranged` in opposing pairs, one pair having a bridged flat end wall of luniform single thickness and being integrally related- With said pair of side walls, each of said walls having free end sides provided with continuous marginal flange portions bent inwardly at right angles of their corresponding walls, the other pair of said side walls having an alternate bridged flat end wall of uniform single thickness and being-integrally related with corresponding side walls, said alternate end wall having two substantially parallel straight side edges spaced inwardly and parallel to interior surface portions of the rst mentioned side walls to provide a pair of slot openings for access into the interiorv of the container, the rst mentioned pair of side walls and liange portions being extended outwardly of said'end wall, the extended anged portions being partially severed from the side wall portions with slit lines terminating adjacent the surface of said end wall, the other of said flange portions being disposed in continuous overlapping relationship with ex- Y terior marginal portions of the last mentioned pair of other sidewalls, the overlapping parts being secured together in seam forming relationship after which, said extended side wall and severed flange portions provide means for closingvand sealing said pair of slot openings.

2. A heavy duty container for liquids made of metallic sheet material comprising a body of substantially rectangular cross section having four side walls arranged in 'opposingpairnV each of said pairs having an integral flat end wall arranged onerat each end of the container, one lof said opposing pair of side walls and end wall having marginal yflanges bent at right angles to the corresponding wa'lls and disposed in overlapping relationship to marginal portions of the second of said opposing pair of side walls in bonded seam formingrrelationship,

Y the end wall'of said second pair of side walls being positioned inwardly of the outer ends of said side walls having the marginal ilanges, said end wallV having two parallel sides spaced inwardly of said side walls to provide two open slots for access into the interior of the container of wall supporting means with which to eifect said-bonded seam-forming relationship, the marginal flange portions of the side walls that project outwardly of said end wall being partially severed from the corresponding transverse side wall portions to provide means LlO for closingy said open slots in closure forming relationship.

3. A heavy duty container according to claim 2 whereinsaid partially severed flange portionsare of dimensional width substantially equal to the width of said kopen slots on two sides of said end wall, said flange portions being bent inwardly and downwardly into said slots, said side' wall portions being bent inwardly and downwardly transverse of'said iiange portions in overlapping relationship, with the exterior surfaces thereof including marginal portions of the exterior of said end wall, said bent portions.

being bonded to said end wall in seam forming relationship.

4. A heavy duty-container according-to claim `2 wherein the other integral end wall at the opposite end of the container is provided with a scalable orifice ,through saidend wall to serve meansV through which to fill and dispense the intended contents of the container after said` closure in the opposite end wall is formed and sealedto providev a reinforced base end of the container.

5. A rectangular container of sheet material comprising four side walls arranged in opposing pairs, each of said pairs having a flat integral end wall of substantially uniform single thickness and alternately positioned at 'Y each end of thecontainer, each pair of side walls being contiguously related to each other, one of said at end.

walls having two parallel side edges spaced inwardly of the longitudinal end sides of the corresponding side wall portions, marginal sides of which are overlapped with bonded marginal ange portions of a second pair of side walls which effect said contiguous relationship, said second pair having wall and ,flange portions extending outwardly and beyond the face of sa-id one end wall:

having the inwardly spaced side edges which provide la pair of opposed slot openings in one end of the container to provide access into the interior thereof with means to marginally support the bending of said overlapping flange portions, the flange portions which extend out-` wardly of said end wall being slit longitudinally of the pair being contiguously related with the other pair, eachy pair of side walls having an integral iiat end wall Vbridging an alternate end of said body portion to provide six enclosure walls ofthe container, one end of the container comprising a flat end wall of single thickness having two straight parallel side edges spaced inwardly of interior` surface portions of two opposed side walls of the container which extend outwardlyof the face' of said endY wall and provide outer enclosure walls for a pair of relatively narrow slot openings adjacent said parallel sides of said end wall, said extended side wall portions having opposed end sides provided with marginal flanges bentr inwardly at substantially right angles to the corresponding wall portions, said` flange portions being longitudinally severed from said wall portions with slit lines which terminate adjacent said end wall, one of said extended.

side wall portions having a pair of parallel irnperforate ylines spacedAv inwardly of yand terminating with said slity lines that define the severedV portions'of said anges, said ange portions being bent inwardly and downwardly into portions of said slot openings, the ends of the bent flanges being opposed and spaced inwardly of said imperforate lines, said corresponding wall portions being bent inwardly and downwardly transversely of said bent flange portions and in overlapping relationship therewith including marginal exterior surface portions of said end wall.

in sealed closure forming relationship, the imperforate -lines in said wall portion upon being severed, constituting means for opening said closure to expose a central dispensing aperture having side edges spaced inwardly of said severed edges and the outer transverse side of said aperture being the 'lowermost wall portion of the partially severed wall of the closure.

7. A container according to claim 6 wherein the openable wall portion of the closure swings upon a pivot line disposed at the outermost side edges of said bent flange portions, said wall portion being adapted to reclose said aperture and be retained Ain closing position by latching means provided in a marginal portion of the opposing end side of another overlapping wall portion of the closure.

8. A six sided liquid carrying container of sheetmaterial comprising a body portion of substantially rectangu- Ilar cross section having side walls arranged in opposing pairs, one pair being continuously extended that provides an integral angeless flatly bridged end wall of said body, the other pair of said side walls being continuously ex tended that provides an opposite integral ilatly bridged end wall of the body, said other pair of side walls and integral end wall being provided with articulated :anges along opposite corner edges thereof, and `the flanges being mitred at converging corner ends and thereby overlap corresponding marginal portions of said one pair of side walls in continuous surface to surface adhered relationship, said rst mentioned end Wall being provided with two parallel opposed straight side edges, each edge be ing spaced inwardly of the interior surface o-f each said other pair of side walls whereby a pair of spaced openings rectangular in shape is provided that by-pass said end wall for `access of seam forming .apparatus ternporarily inserted into the interior of said six enclosure walls of the con-tainer, upon which apparatus said adhered surfaces are united together in seam forming relationship, said other pair of side Walls and flange portions thereof being extended outwardly of the adjacent openings, the ange portions being slit along corner edges extended inwardly to said opening whereby bendable wall portions are provided suitable for separately closing the openings -in seam forming relationship after withdrawal of said seam forming apparatus.

9. The method of making a container of two bendable strips of sheet material and of forming a first and second component part of said strips to provide six enclosure walls of the container structure simultaneously when assembling said components together, which comprises bending one of said strips U-shaped to construct the irst component and forming two opposed side walls and an end wall, offsetting two opposed straight side edges of the end wall inwardly of longitudinal corner edges of the side walls and offsetting end edge portions thereof from the adjacent plane of the transversely positioned end wall, bending the second strip U-shaped to construct the second component and forming two opposed side walls and an end wall, providing flanged extensions with mitre forming joints of latter mentioned walls and articulating the anged portions along continuous corner edges of corresponding side walls and end wall, inserting said first component into the second component with respective end Walls opposed and with articulated flanges of second component overlapping corresponding margins of side walls of rst component, extending portions of the second component side walls and ange portions thereof outwardly of the end wall of rst component, slitting corner edges of the extended flange portions inwardly to substantially the exterior surface plane of end wall of irst component, aligning longitudinal inwardly opposed free edges of said outwardly extending ange portions with said inwardly offset straight edges of the end Wall of rst component, thereby providing a pair of slot openings at two opposing sides of said end wall to provide access into the interior of the six enclosure walls of 'the formed container for inserting therein seam forming apparatus with which to adhere the overlapping larticulated anges with surface contacting continuing margins of side waIls of the rst component.

10. A heavy duty container of rigid sheet material cornprising a bent structure formed of said material having four side walls arranged in opposing pairs to provide a body portion of substantially rectangular cross section, and each opposing pair of side walls being provided with an `integral end wall that is arranged to bridge across one end of said body portion of the container, one pair of opposing side walls and its integral end wall having marginal anges overlapping corresponding marginal surface portions of the adjacent pair of opposing side walls and being articulated along corner edges of dependent side walls and end wall in seam forming relationship, the pair of said adjacent side walls having respective end edges thereof abutted upon the interior surface of the end wall having the ilanges, said one pair of side walls and anges having a portion thereof extended outwardly of the end wall portion of said adjacent pair of side walls, said end wall being provided with two opposed straight side edges, each edge being spaced inwardly of an interior surface portion of the adjacent outwardly extended side wall and each straight edge. being aligned with the transverse inwardly disposed longitudinal edge of said side wall flanges, said pair of adjacent side walls being provided with transverse end terminal edge portions that are spaced inwardly from the exterior plane of its end wall portion and thereby provide a ledge across opposite ends of a pair of slot openings provided by said in wardly spaced edges of the end wall to provide means for access into the container, the outwardly extended flange portions each being separated from their respective side wall portion along a portion of said articulated corner edge and the separated portion being terminated inwardly at said ledge whereby, the separated portion of each ange is bent inwardly over said ledge and downwardly into said opening, longitudinal side edges of each pair of bent flange portions providing a pair of end opposed ledges disposed at right angles in edge to face abutment across the interior surface of the outwardly extended side wall portion, the exterior face of said ledges being coplanar in relation to the exterior face of the adjacent end wall, each of the opposed side wall portions being bent inwardly over a pair of said ledges and downwardly upon the faces of said coplanar surfaces, the surface to surface engagements of said bent portions being united together in seam forming relationship, the opposite end wall of the container structure having orifice means provided with which to ll and dispense container contents.

11. A container of sheet material comprising a body portion of substantially rectangular cross section having four side walls arranged in opposing pairs,` each opposing pair being provided with a flatly bridged integral end wall arranged at an end of the body portion and the four side walls being joined together in pairs along their respective corner edges in seam forming relationship, one of said end walls having a pair of opposite side edges that are spaced inwardly of parallel outwardly projected adjacent side wall portions that are provided with right angular inwardly opposed anges being articulated along corner edges that overlap the body marginal portions of the pair of side walls having said one end wall, and being united together in said seam forming relationship, the projected portions only of said flanges being longitudinally separated from the adjacent projected portion of side wall along corner edges thereof, the longitudinal side edges of said separated flange portions being arranged to be coincident with said inwardly spaced edges of the adjacent end wall and outwardly spaced interior surface portion of adjacent side walls, thereby being adapted when bent to snugly t into a pair of open slots that are provided by said spaced edges of the end wall alfording means through which to gain temporary access into the interior of the six enclosure walls of the container, said separated projectedwall portions providing means when bent,l to..closeV and seal said open slots in Vsearnforming relationship. l

l2. The method` of making a container of two elongated strip blanks of sheet material and of providing a plurality of side walls arranged in opposing pairs and of arranging an end wall of each pair at an opposite end of the containenvwhich includes bending one of said strips to provide one pair of opposing side walls and forming an integral wall portion bridging across one end thereof, spacing two opposite side edges of the one end wall inwardly of the longitudinal side edges of dependent side walls, bending the second` strip to provide another pair ofopposing side walls and forming an integral wall portion thereof. bridging across one end thereof, bending marginal flange portions of latter mentioned walls inwardly along Acorner edges thereof and articulating said flanges to provide mitre forming joints at converging corner ends ofk side and end wall portions, assembling said bent strips together and arranging the single end wall portion of each strip to be positioned one at each end of enclosure forming side walls, extending a portion of the flanged side walls outwardly of the lirst mentioned end wall, thereby providing two slot openings at opposite sidesl of said end Wall, abutting longitudinal side edges and end edges of said one pair of side walls upon interior faces of side and end walls that provide the flanges to overlap marginal portions of rst mentioned side Walls adjacent their abutting edges, arranging the longitudinal overlapping flanges so that their inwardly opposed edges align withsaidinwardly spaced side/,edges Aof theirst` mentioned vend wall,'slitting the. outwardly extended portionjof each flange along the corner edge thereof and wall portions uniting the seams, and upon withdrawing.

said anvilnbars; bending said outwardly extended vllange portions from opposite ends of each slot lopening to t therein, and then bending the outwardly extendedtransverse side Walliportions from the outer side ofteachpopen ingto close over the bent flange portions includingrportions ofthe adjacent 'endwall 'and sealing the bent portions in seam forming relationship.

References` Cited in thelle of this patent UNITED STATES PATENTSk 1,712,249 Byrne May 7, 1929` 1,909,214 Nagle May 16, 1933 2,010,972 Weiss Aug. 13, 1935 2,102,009 Kondolf Dec. 14, 1937` 2,234,167 Hothersall Mar. 11, 1941 2,391,639 Meller Dec. 25, 1945 2,488,710 Cooper Nov. 22, 1949 2,611,527 Fisher a Sept. 23, 1952j 

